DTcms-【XML】-XML的增删查改

学习目标
1.获取一个节点，并转化为一个实体对象
获取根节点对象->获得子节点列表->遍历匹配->唯一查找

        public Model.url_rewrite GetInfo(string attrValue)
        {
            Model.url_rewrite model = new Model.url_rewrite();
            string filePath = Utils.GetXmlMapPath(DTKeys.FILE_URL_XML_CONFING);
            XmlDocument doc = new XmlDocument();
            doc.Load(filePath);
            XmlNode xn = doc.SelectSingleNode("urls");//获取根节点对象
            XmlNodeList xnList = xn.ChildNodes;//获得子节点列表
            if (xnList.Count > 0)//遍历匹配查找
            {
                foreach (XmlElement xe in xnList)
                {
                    if (xe.Attributes["name"].Value.ToLower() == attrValue.ToLower())//name是唯一的
                    {
                        model.name = xe.Attributes["name"].Value;
                        model.path = xe.Attributes["path"].Value;
                        model.pattern = xe.Attributes["pattern"].Value;
                        model.page = xe.Attributes["page"].Value;
                        model.querystring = xe.Attributes["querystring"].Value;
                        model.templet = xe.Attributes["templet"].Value;
                        model.channel = xe.Attributes["channel"].Value;
                        model.type = xe.Attributes["type"].Value;
                        model.inherit = xe.Attributes["inherit"].Value;
                        return model;
                    }
                }
            }
            return null;
        }

2.增加一个节点
加载XML文件--获得父节点urls--创建元素--设置属性--追加节点--保存xml文件

        /// <summary>
        /// 增加节点
        /// </summary>
        public bool Add(Model.url_rewrite model)
        {
            try
            {
                string filePath = Utils.GetXmlMapPath(DTKeys.FILE_URL_XML_CONFING);
                XmlDocument doc = new XmlDocument();
                doc.Load(filePath);

                XmlNode xn = doc.SelectSingleNode("urls");
                XmlElement xe = doc.CreateElement("rewrite");

                xe.SetAttribute("name", model.name);
                xe.SetAttribute("path", model.path);
                xe.SetAttribute("pattern", model.pattern);
                xe.SetAttribute("page", model.page);
                xe.SetAttribute("querystring", model.querystring);
                xe.SetAttribute("templet", model.templet);
                xe.SetAttribute("channel", model.channel.ToString());
                xe.SetAttribute("type", model.type);
                xe.SetAttribute("inherit", model.inherit);

                xn.AppendChild(xe);
                doc.Save(filePath);

                return true;
            }
            catch
            {
                return false;
            }
        }

3.修改节点
操作的流程大致都差不多

        /// <summary>
        /// 修改节点
        /// </summary>
        public bool Edit(Model.url_rewrite model)
        {
            string filePath = Utils.GetXmlMapPath(DTKeys.FILE_URL_XML_CONFING);
            XmlDocument doc = new XmlDocument();
            doc.Load(filePath);
            XmlNode xn = doc.SelectSingleNode("urls");

            //子节点列表
            XmlNodeList xnList = xn.ChildNodes;

            if (xnList.Count > 0)
            {
                foreach (XmlElement xe in xnList)
                {
                    //遍历查找
                    if (xe.Attributes["name"].Value.ToLower() == model.name.ToLower())
                    {
                        //设置属性
                        xe.Attributes["path"].Value = model.path;
                        xe.Attributes["pattern"].Value = model.pattern;
                        xe.Attributes["page"].Value = model.page;
                        xe.Attributes["querystring"].Value = model.querystring;
                        xe.Attributes["templet"].Value = model.templet;
                        xe.Attributes["channel"].Value = model.channel.ToString();
                        xe.Attributes["type"].Value = model.type;
                        xe.Attributes["inherit"].Value = model.inherit;

                        doc.Save(filePath);
                        return true;
                    }
                }
            }
            return false;
        }

 4.删除节点

        /// <summary>
        /// 删除节点
        /// </summary>
        public bool Remove(string attrName, string attrValue)
        {
            string filePath = Utils.GetXmlMapPath(DTKeys.FILE_URL_XML_CONFING);
            XmlDocument doc = new XmlDocument();
            doc.Load(filePath);
            XmlNode xn = doc.SelectSingleNode("urls");
            XmlNodeList xnList = xn.ChildNodes;

            if (xnList.Count > 0)
            {
                for (int i = xnList.Count - 1; i >= 0; i--)
                {
                    XmlElement xe = (XmlElement)xnList.Item(i);
                    if (xe.Attributes[attrName].Value.ToLower() == attrValue.ToLower())
                    {
                        xn.RemoveChild(xe);//从父节点中移除子节点
                    }
                }
                doc.Save(filePath);
                return true;
            }
            return false;
        }